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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common
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* Development and Distribution License("CDDL") (collectively, the
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* "License"). You may not use this file except in compliance with the
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* License. You can obtain a copy of the License at
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* http://www.netbeans.org/cddl-gplv2.html
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* or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
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* specific language governing permissions and limitations under the
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* License. When distributing the software, include this License Header
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* Notice in each file and include the License file at
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* nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the GPL Version 2 section of the License file that
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* accompanied this code. If applicable, add the following below the
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* License Header, with the fields enclosed by brackets [] replaced by
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* your own identifying information:
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* "Portions Copyrighted [year] [name of copyright owner]"
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* The Original Software is NetBeans. The Initial Developer of the Original
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* Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
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* Microsystems, Inc. All Rights Reserved.
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* If you wish your version of this file to be governed by only the CDDL
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* "[Contributor] elects to include this software in this distribution
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* However, if you add GPL Version 2 code and therefore, elected the GPL
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* made subject to such option by the copyright holder.
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package org.netbeans.modules.editor.structure;
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import java.util.Collection;
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import java.util.WeakHashMap;
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import org.netbeans.api.editor.mimelookup.MimeLookup;
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import org.netbeans.api.editor.mimelookup.MimePath;
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import org.netbeans.modules.editor.structure.spi.DocumentModelProvider;
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import org.openide.ErrorManager;
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import org.openide.util.Lookup;
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* Document model factory that obtains the DocumentModel instancies
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* by reading the xml layer.
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* The registration are read from the following folder in the system FS:
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* Editors/<mime-type>/DocumentModel
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* @author Marek Fukala
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public class DocumentModelProviderFactory {
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static final String FOLDER_NAME = "DocumentModel"; //NOI18N
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private Map<String, DocumentModelProvider> mime2provider;
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private static DocumentModelProviderFactory defaultProvider = null;
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public static DocumentModelProviderFactory getDefault() {
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if(defaultProvider == null) {
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defaultProvider = new DocumentModelProviderFactory();
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return defaultProvider;
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private DocumentModelProviderFactory() {
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mime2provider = new WeakHashMap<String, DocumentModelProvider>();
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/* returns a DocumentModelFactory according to the layer */
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public DocumentModelProvider getDocumentModelProvider(String mimeType) {
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DocumentModelProvider provider = null; // result
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if(mimeType != null) {
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provider = mime2provider.get(mimeType);
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if (provider == null) { // not cached yet
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Lookup mimeLookup = MimeLookup.getLookup(MimePath.get(mimeType));
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Collection<? extends DocumentModelProvider> providers =
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mimeLookup.lookup(new Lookup.Template<DocumentModelProvider>(DocumentModelProvider.class)).allInstances();
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if(providers.size() > 1)
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ErrorManager.getDefault().log(ErrorManager.INFORMATIONAL, "Only one DocumentModelProvider can be registered for one mimetype!");
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if(providers.size() == 0)
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ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, new IllegalStateException("There isn't any DocumentModelProvider registered for " + mimeType + " mimetype!"));
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provider = providers.size() > 0 ? (DocumentModelProvider)providers.iterator().next() : null;
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mime2provider.put(mimeType, provider);
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} else return provider;
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ErrorManager.getDefault().notify(ErrorManager.INFORMATIONAL, new NullPointerException("mimeType cannot be null!"));